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Why do volcanoes “die”?

Why do volcanoes “die”? -Loretta, 11, Mexico

Dear Loretta,

Each volcano’s life is a little different. Many of them are born when big chunks of the Earth’s crust, or tectonic plates, collide or move away from each other. The moving plates force hot, liquid rock, or magma, to rise up from deep within the Earth. » More …